12-09-2017, 02:34 PM
(12-09-2017, 08:46 AM)Helmut Winkler wrote: You are not allowed to view links. Register or Login to view.Seems to have ben common practice for star maps, clm 826 (about the same time) has stars of different sizes and numbers of arms for different degrees of brightness
Has there been any tradition to group stars into distinct classes according to degrees of brightness, and to assign separate significance to those classes?

